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Sample: Two-Way Listener

[Applies to: Microsoft Dynamics CRM 2011]

This sample registers a remote service plug-in that executes whenever a Microsoft Dynamics CRM message is posted to a two-way endpoint on the Windows Azure Service Bus. When the plug-in executes, it prints to the console the contents of the Microsoft Dynamics CRM execution context contained in the message.

Requirements

This sample code is for Microsoft Dynamics CRM 2011, and can be found in the following location in the SDK download:

SDK\SampleCode\CS\Azure\TwoWayListener\TwoWayListener.cs

Demonstrates

This sample shows how to write a Windows Azure Service Bus Listener for a two-way endpoint contract.

Example


using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Text;

// This namespace is found in the Microsoft.Xrm.Sdk.dll assembly
// found in the SDK\bin folder.
using Microsoft.Xrm.Sdk;

// This namespace is found in Microsoft.ServiceBus.dll assembly 
// found in the Windows Azure SDK
using Microsoft.ServiceBus;

namespace Microsoft.Crm.Sdk.Samples
{
    /// <summary>
    /// Creates a two-way endpoint listening for messages from the Windows Azure Service
    /// Bus.
    /// </summary>
    public class TwoWayListener
    {
        #region How-To Sample Code

        /// <summary>
        /// The Execute method is called when a message is posted to the Azure Service
        /// Bus.
        /// </summary>
        [ServiceBehavior]
        private class TwoWayEndpoint : ITwoWayServiceEndpointPlugin
        {
            #region ITwoWayServiceEndpointPlugin Member

            /// <summary>
            /// This method is called when a message is posted to the Azure Service Bus.
            /// </summary>
            /// <param name="context">Data for the request.</param>
            /// <returns>A 'Success' string.</returns>
            public string Execute(RemoteExecutionContext context)
            {
                Utility.Print(context);
                return "Success";
            }

            #endregion
        }

        /// <summary>
        /// Prompts for required information and hosts a service until the user ends the 
        /// session.
        /// </summary>
        public void Run()
        {
            ServiceBusEnvironment.SystemConnectivity.Mode = ConnectivityMode.Http;

            Console.Write("Enter your Azure service namespace: ");
            string serviceNamespace = Console.ReadLine();

            // The service namespace issuer name to use.  If one hasn't been setup
            // explicitly it will be the default issuer name listed on the service
            // namespace.
            Console.Write("Enter your service namespace issuer name: ");
            string issuerName = Console.ReadLine();

            // Issuer secret is the Windows Azure Service Bus namespace current management key.
            Console.Write("Enter your service namespace issuer key: ");
            string issuerKey = Console.ReadLine();

            // Input the same path that was specified in the Service Bus Configuration dialog
            // when registering the Azure-aware plug-in with the Plug-in Registration tool.
            Console.Write("Enter your endpoint path: ");
            string servicePath = Console.ReadLine();

            // Leverage the Azure API to create the correct URI.
            Uri address = ServiceBusEnvironment.CreateServiceUri(
                Uri.UriSchemeHttps,
                serviceNamespace,
                servicePath);

            Console.WriteLine("The service address is: " + address);

            // Create the shared secret credentials object for the endpoint matching the 
            // Azure access control services issuer 
            var sharedSecretServiceBusCredential = new TransportClientEndpointBehavior()
            {
                TokenProvider = TokenProvider.CreateSharedSecretTokenProvider(issuerName, issuerKey)
            };

            // Using an HTTP binding instead of a SOAP binding for this endpoint.
            WS2007HttpRelayBinding binding = new WS2007HttpRelayBinding();
            binding.Security.Mode = EndToEndSecurityMode.Transport;

            // Create the service host for Azure to post messages to.
            ServiceHost host = new ServiceHost(typeof(TwoWayEndpoint));
            host.AddServiceEndpoint(typeof(ITwoWayServiceEndpointPlugin), binding, address);

            // Create the ServiceRegistrySettings behavior for the endpoint.
            var serviceRegistrySettings = new ServiceRegistrySettings(DiscoveryType.Public);

            // Add the service bus credentials to all endpoints specified in configuration.

            foreach (var endpoint in host.Description.Endpoints)
            {
                endpoint.Behaviors.Add(serviceRegistrySettings);
                endpoint.Behaviors.Add(sharedSecretServiceBusCredential);
            }

            // Begin listening for messages posted to Azure.
            host.Open();

            Console.WriteLine(Environment.NewLine + "Listening for messages from Azure" +
                Environment.NewLine + "Press [Enter] to exit");

            // Keep the listener open until Enter is pressed.
            Console.ReadLine();

            Console.Write("Closing the service host...");
            host.Close();
            Console.WriteLine(" done.");
        }

        /// <summary>
        /// Containts methods to display the RemoteExecutionContext provided when a 
        /// message is posted to the Azure Service Bus.
        /// </summary>
        private static class Utility
        {
            /// <summary>
            /// Writes out the RemoteExecutionContext to the Console.
            /// </summary>
            /// <param name="context"></param>
            public static void Print(RemoteExecutionContext context)
            {
                Console.WriteLine("----------");
                if (context == null)
                {
                    Console.WriteLine("Context is null.");
                    return;
                }

                Console.WriteLine("UserId: {0}", context.UserId);
                Console.WriteLine("OrganizationId: {0}", context.OrganizationId);
                Console.WriteLine("OrganizationName: {0}", context.OrganizationName);
                Console.WriteLine("MessageName: {0}", context.MessageName);
                Console.WriteLine("Stage: {0}", context.Stage);
                Console.WriteLine("Mode: {0}", context.Mode);
                Console.WriteLine("PrimaryEntityName: {0}", context.PrimaryEntityName);
                Console.WriteLine("SecondaryEntityName: {0}", context.SecondaryEntityName);

                Console.WriteLine("BusinessUnitId: {0}", context.BusinessUnitId);
                Console.WriteLine("CorrelationId: {0}", context.CorrelationId);
                Console.WriteLine("Depth: {0}", context.Depth);
                Console.WriteLine("InitiatingUserId: {0}", context.InitiatingUserId);
                Console.WriteLine("IsExecutingOffline: {0}", context.IsExecutingOffline);
                Console.WriteLine("IsInTransaction: {0}", context.IsInTransaction);
                Console.WriteLine("IsolationMode: {0}", context.IsolationMode);
                Console.WriteLine("Mode: {0}", context.Mode);
                Console.WriteLine("OperationCreatedOn: {0}", context.OperationCreatedOn.ToString());
                Console.WriteLine("OperationId: {0}", context.OperationId);
                Console.WriteLine("PrimaryEntityId: {0}", context.PrimaryEntityId);
                Console.WriteLine("OwningExtension LogicalName: {0}", context.OwningExtension.LogicalName);
                Console.WriteLine("OwningExtension Name: {0}", context.OwningExtension.Name);
                Console.WriteLine("OwningExtension Id: {0}", context.OwningExtension.Id);
                Console.WriteLine("SharedVariables: {0}", (context.SharedVariables == null
                    ? "NULL" : SerializeParameterCollection(context.SharedVariables)));
                Console.WriteLine("InputParameters: {0}", (context.InputParameters == null
                    ? "NULL" : SerializeParameterCollection(context.InputParameters)));
                Console.WriteLine("OutputParameters: {0}", (context.OutputParameters == null
                    ? "NULL" : SerializeParameterCollection(context.OutputParameters)));
                Console.WriteLine("PreEntityImages: {0}", (context.PreEntityImages == null
                    ? "NULL" : SerializeEntityImageCollection(context.PreEntityImages)));
                Console.WriteLine("PostEntityImages: {0}", (context.PostEntityImages == null
                    ? "NULL" : SerializeEntityImageCollection(context.PostEntityImages)));
                Console.WriteLine("----------");
            }

            /// <summary>
            /// Writes out the attributes of an entity.
            /// </summary>
            /// <param name="e">The entity to serialize.</param>
            /// <returns>A human readable representation of the entity.</returns>
            private static string SerializeEntity(Entity e)
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendFormat("{0} LogicalName: {1}{0} EntityId: {2}{0} Attributes: [",
                    Environment.NewLine,
                    e.LogicalName,
                    e.Id);
                foreach (KeyValuePair<string, object> parameter in e.Attributes)
                {
                    sb.AppendFormat("{0}: {1}; ", parameter.Key, parameter.Value);
                }
                sb.Append("]");
                return sb.ToString();
            }

            /// <summary>
            /// Flattens a collection into a delimited string.
            /// </summary>
            /// <param name="parameterCollection">The values must be of type Entity 
            /// to print the values.</param>
            /// <returns>A string representing the collection passed in.</returns>
            private static string SerializeParameterCollection(ParameterCollection parameterCollection)
            {
                StringBuilder sb = new StringBuilder();
                foreach (KeyValuePair<string, object> parameter in parameterCollection)
                {
                    Entity e = parameter.Value as Entity;
                    if (e != null)
                    {
                        sb.AppendFormat("{0}: {1}", parameter.Key, SerializeEntity(e));
                    }
                    else
                    {
                        sb.AppendFormat("{0}: {1}; ", parameter.Key, parameter.Value);
                    }
                }
                return sb.ToString();
            }

            /// <summary>
            /// Flattens a collection into a delimited string.
            /// </summary>
            /// <param name="entityImageCollection">The collection to flatten.</param>
            /// <returns>A string representation of the collection.</returns>
            private static string SerializeEntityImageCollection(EntityImageCollection entityImageCollection)
            {
                StringBuilder sb = new StringBuilder();
                foreach (KeyValuePair<string, Entity> entityImage in entityImageCollection)
                {
                    sb.AppendFormat("{0}{1}: {2}", Environment.NewLine, entityImage.Key,
                        SerializeEntity(entityImage.Value));
                }
                return sb.ToString();
            }
        }

        #endregion How-To Sample Code

        /// <summary>
        /// Standard Main() method used by most SDK samples.
        /// </summary>
        static public void Main()
        {
            try
            {
                TwoWayListener app = new TwoWayListener();
                app.Run();
            }
            catch (FaultException<ServiceEndpointFault> ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine("Message: {0}", ex.Detail.Message);
                Console.WriteLine("Inner Fault: {0}",
                    null == ex.InnerException.Message ? "No Inner Fault" : "Has Inner Fault");
            }
            catch (System.TimeoutException ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine("Message: {0}", ex.Message);
                Console.WriteLine("Stack Trace: {0}", ex.StackTrace);
                Console.WriteLine("Inner Fault: {0}",
                    null == ex.InnerException.Message ? "No Inner Fault" : ex.InnerException.Message);
            }
            catch (System.Exception ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine(ex.Message);

                // Display the details of the inner exception.
                if (ex.InnerException != null)
                {
                    Console.WriteLine(ex.InnerException.Message);

                    FaultException<ServiceEndpointFault> fe = ex.InnerException
                        as FaultException<ServiceEndpointFault>;
                    if (fe != null)
                    {
                        Console.WriteLine("Message: {0}", fe.Detail.Message);
                        Console.WriteLine("Inner Fault: {0}",
                            null == ex.InnerException.Message ? "No Inner Fault" : "Has Inner Fault");
                    }
                }
            }

            finally
            {
                Console.WriteLine("Press <Enter> to exit.");
                Console.ReadLine();
            }
        }
    }
}

See Also

Microsoft Dynamics CRM 2011
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